Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
J. Phys. IV France 03 (1993) C9-319-C9-326
Summary of studies on hot corrosion of iron-based alloys by sodium sulfate in O2/SO2/SO3 environmentYunshu Zhang1 and Weitao Wu2
1 Shanghai Institute of Metallurgy, Academia Sinica, Shanghai 200050, China
2 Institute of Corrosion and Protection of Metals, Academia Sinica, Shenyang 110015, China
Iron base heat-resistant alloys are widely used in high temperature environments, especially in civil and industrial boilers and other combustors. This type of alloys was found to undergo hot corrosion when covered with a sulfate deposit. Recent studies of sulfate-deposit-induced hot corrosion of iron-base alloys are selectively reviewed in this paper. Emphasis is placed on studies of the hot corrosion occurring at relatively low temperatures, concerning the thermodynamics of the formation of liquid sulfate eutectics, the corrosion behavior of various iron-base alloys, and an electrochemical mechanism proposed by the present authors. In addition, electrochemical measurements for the evaluation of hot corrosion resistance of iron-base alloys are briefly reported. Some coatings were prepared and their performance in hot corrosion environments is included in this paper.
© EDP Sciences 1993